/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.db.mpp.metric;

import org.apache.iotdb.commons.service.metric.enums.Metric;
import org.apache.iotdb.commons.service.metric.enums.Tag;
import org.apache.iotdb.db.engine.cache.TimeSeriesMetadataCache;
import org.apache.iotdb.metrics.AbstractMetricService;
import org.apache.iotdb.metrics.metricsets.IMetricSet;
import org.apache.iotdb.metrics.utils.MetricLevel;
import org.apache.iotdb.metrics.utils.MetricType;

import java.util.Objects;

public class TimeSeriesMetadataCacheMetrics implements IMetricSet {

    private final TimeSeriesMetadataCache timeSeriesMetadataCache;

    public TimeSeriesMetadataCacheMetrics(TimeSeriesMetadataCache timeSeriesMetadataCache) {
        this.timeSeriesMetadataCache = timeSeriesMetadataCache;
    }

    @Override
    public void bindTo(AbstractMetricService metricService) {
        metricService.createAutoGauge(
                Metric.CACHE_HIT.toString(),
                MetricLevel.IMPORTANT,
                timeSeriesMetadataCache,
                l -> (long) timeSeriesMetadataCache.calculateTimeSeriesMetadataHitRatio(),
                Tag.NAME.toString(),
                "timeSeriesMeta");
        metricService.createAutoGauge(
                Metric.CACHE_HIT.toString(),
                MetricLevel.IMPORTANT,
                timeSeriesMetadataCache,
                TimeSeriesMetadataCache::calculateBloomFilterHitRatio,
                Tag.NAME.toString(),
                "bloomFilter");
    }

    @Override
    public void unbindFrom(AbstractMetricService metricService) {
        metricService.remove(
                MetricType.AUTO_GAUGE, Metric.CACHE_HIT.toString(), Tag.NAME.toString(), "timeSeriesMeta");
        metricService.remove(
                MetricType.AUTO_GAUGE, Metric.CACHE_HIT.toString(), Tag.NAME.toString(), "bloomFilter");
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        TimeSeriesMetadataCacheMetrics that = (TimeSeriesMetadataCacheMetrics) o;
        return Objects.equals(timeSeriesMetadataCache, that.timeSeriesMetadataCache);
    }

    @Override
    public int hashCode() {
        return Objects.hash(timeSeriesMetadataCache);
    }
}
